Leaf-turning device



2 Sheets-Sheet 1.

(No Model.) I

W. 0. CAMPBELL.

LEAP TURNING DEVICE.

No. 574,659. Patented Jan. 5, 1897.

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No. 574,659. Patented Jan. 5,1897.

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M Z14 4 6a W UNITED STATES PATENT OFFICE.

XVINDSOR O. CAMPBELL, OF KANSAS CITY, MISSOURI.

LEAF-TURNING DEVICE.

SPECIFICATION forming part of Letters Patent No. 574,659, dated. January5, 1897.

Application filed April 20, 1896. Serial No. 588,409. (No model.)

To all whom it may concern:

Be it known that LWINDsOR O. CAMPBELL, a citizen of the United States,residing at Kansas City, in the county of Jackson and State of Missouri,have invented certain new and useful Improvements in Leaf-TurningDevices, of which the following is a specifica tion, reference being hadtherein to the accompanying drawings.

My invention relates to improvements in leaf-turning devices.

The object of my invention is to provide a device for turning the leavesof sheet-music.

My invention is adapted to be used in connection with a piano or othersimilar instrument.

My invention consists in certain novel features of constructionhereinafter fully set forth, and described in the accompanying drawingsillustrative of my invention.

Figure 1 represents a front elevation view. Fig. 2 represents a top viewwith the cover of the box removed. Fig. 3 represents a longitudinalvertical sectional view taken on the dot-ted lines a b of Fig. 2. Fig. 4represents a plan view of one of the pivoted leaf-arms in an openposition, together with its operating cam-arm. Fig. 5 represents a planview of the same in the closed position. The position of the parts whenthe leaf-turning arm is partially revolved is shown in dotted lines inthis figure. Fig. 6 represents an elevation view of the leaf-attachingdevice with which each leaf-armis provided. Fig.7 represents a frontview of the sliding block with the cam-arms removed therefrom. Fig. 8represents a front elevation view of the leaf-turnin g arms, cams, andcentral pivot-post.

Similar numerals of reference indicate simi lar parts.

1 indicates the inc-losing casing provided with a longitudinal openingin its front and two openings 2 and 3 in the front edge of the cover,which permit the pivoted leaf-arms l to pass from their open to theirclosed positions. Secured to the upper side of the bottom plate of thebox or casing 1, near its center, is a vertical post 5. Upon this postare pivoted the leaf-arms 4. These leaf-arms are horizontally disposedand are provided each with a vertical opening near its inner endrevolubly fitted to the post 5. The outer end of each leaf-arm isprovided with a vertical projection 6, to which is removably fitted athimble 7, to the upper end of which are secured two vertical arms 8,between which is placed one of the leaves to be turned. The inner end ofeach of the arms a is bifurcated. The lowest leaf-arm is the longest,and each arm is shorter than'the one directly below it, so that the armsmay fold together without interference one with the other. Between eachtwo of the leaf-arms and below the lowest leaf-arm upon the post 5 is acam-disk 19, each of which is provided with a central opening fitted tothe post 5, and a tongue 10, fitted within a longitudinal groove in theouter periphery of the post 5. This tongue and grooved connection of thecams 9 and the post 5 is to prevent circumferential movement of the cam.The rear edge of each of the cams 9 is forwardly beveled upon each sideof the post 5. l\lovably fitted within a longitudinal slot 1.1 in thebase-plate of the casing 1 and to the right of the post 5 is aslide-block 12, the front and rear sides of which are provided withlongitudinal grooves, within which are located the edges of thebase-plate next to the slot 11. From the under side of the baseplateforwardly extends an arm 13, by which the hand moves the slide-block tothe right or left of the slot 11. Secured to the upper side of theslide-block is a Vertical post 14:, upon which is pivoted, near theirright ends, a series of cam-arms 15, located one above the other andadapted to operate between the leaf-arms at. The front side of each ofthe cam-arms 15 is provided with a forwardlyprojecting convex curvedportion 16, which is in line with and adapted to follow along the rearedge of one of the cam-collars 9. Near the front of the said curvedportion 16 and secured to the upper side of the cam-arm. is a pin 17,adapted to enter the slot in the bifurcated end of the leaf-arm at.

Between each two of the cam-arms 15 upon the post 11- is a collar 18,corresponding in thickness to the cam-arms 15. Secured to the upper sideof the slide block and to the right and rear of the post 14. isavertical post 19. Each of the cam-arms at its right end is provided witha projection 20, adapted to strike against the front face of the post19, for the purpose of preventing too far a for- ICO ward movement ofthe left end of the camarm. Secured at its right end to the post 1.) isa vertical comb-shaped spring 21, each teeth of which presses againstthe rear edge of the cam-arm which is in front of it.

The camarms 15 are all of different length. The distance between theposts 17 of adjacent can't-arms is sufficient to allow one of thecam-arms to turn its leaf-arm a half-revolution before the projection 17on the adjacent cam-arm operates to turn the adjacent leaf-arm. Securedto the top of the casing and to the rear of the post 5 is a verticalpost 22. Parallel therewith is a vertical post 23, the upper and lowerends of which are pro vided with two horizontal arms 9-1, each of whichpasses through a transverse opening in the post The outer end of each ofthe arms 2-]; is screw-tln'eadcd and is provided with a nut 25.Encircling each of the arms Q-t, be

tween the nut and the post 22, is a coiled spring 26.

My invention is operated as follows: The leaves that are to be turnedare inserted at their rear edges between the clamping-rods 22 and 23,and a leaf isinserted one between the fingers of each of the arms 8. Thelength of the arms at is such as to engage each leaf near the middle.Before inserting the leaves the slide-block is moved to the left of theslot, thus turning all of the leaf-arms to the righthand position. Thenby scizingthe projection 13 with the hand the slide-block is drawn tothe right. The shortest cam-arm has its projection l7 engage with theslot in the bifurcated end of the upper leaf-arm. By eontinuing to drawthe slide-block to the right the convex face of the cam arm follows laround the cam-face upon the rear of the i cam-c0llar 9, forcing theleft end of the camarm to the rear until the center of the post has beenpassed, after which the tooth on the spring 21 forces the outer end. ofthe camarm forward until the projection 20 has come in contact with thefront of the post 19. By this time the leaf-arm has been revolvedhalf-way around, thus turning the leaf of music so that the next pagemay be read. The remaining leaves are turned in the same manner that is,by continuing to force the slide-block to the right. In case it isdesired to turn a leaf backward for the purpose of repeating the readingof the music upon the former page the slide-block is moved to the left.

Various modifications of my invention may be made without departing fromits spirit.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is

In a leaf-turner, the combination with a suitable frame, of a postsecured thereto, a leaf-tn rnin g arm provided at one end with aleaf-engaging device and at the other end wi th a slot, a cam mountedupon the said post, an operating-arm secured at one end to a supportlongitudinally movable upon the frame, the other end of theoperating-arm being transversely movable and provided with a projectionadapted to engage the slot .in the leaf-turning arm, thetraiiisversely-movablc end of the operating-arm being adapted to engagethe cam at the same time the leafturning arm is engaged by the oierating arm, substantially as described.

In testimony whereof I at'tix my signature in presence of two witnesses.

WINDSOR O. CAMPBELL.

Witnesses:

L. CARI-110K, U. (l. CRANE.

